Could anyone help me work out these simultaneous equations, i am really struggling.

A)

3p+q=5

p+3q=-1

B)

7y-9x-13=0

5y-8x-14=0

C)

3.2a -0.7b -0.47 = 0

2.4a +0.35b -0.265 = 0

D)

3r-2t=-0.2

r+s=2.4

4s-t=7.3

E)

i1 + i2 + i3 = 0

50 i1 + 30 i2 = 16

-20 i2 + 5 i3 = -6

A)

3p+q=5

p+3q=-1

B)

7y-9x-13=0

5y-8x-14=0

C)

3.2a -0.7b -0.47 = 0

2.4a +0.35b -0.265 = 0

D)

3r-2t=-0.2

r+s=2.4

4s-t=7.3

E)

i1 + i2 + i3 = 0

50 i1 + 30 i2 = 16

-20 i2 + 5 i3 = -6

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